\begin{figure}[tbp]
\centering
\begin{tikzpicture}[domain=0:7]
\draw[-] (0,4.5) -- (0,4.5) node[left] {$n$};
\draw[-,thick] (0,1.2) -- (0,1.2) node[left] {$1$}; 
\node[inner sep=0pt] (fig) at (3.52,2.31) {\includegraphics[width=.45\textwidth]{figureG1.png}};
%
\draw[-, gray, thick] (0.08,.1) -- (0.08,0) ;
\draw[-] (0.08,0) -- (0.08,0) node[below] {0};
%
\draw[-, gray, thick] (2.25,0) -- (2.25,0) ;
\draw[-] (2.25,.1) -- (2.25,0) node[below] {$\tilde{L}$};
%
\draw[-, gray, thick] (1.45,0) -- (1.45,0) ;
\draw[-] (1.45,.1) -- (1.45,0) node[below] {$\bar{L}$};
%
\draw[-, gray, thick] (4.7,0.1) -- (4.7,0) ;
\draw[-] (4.7,0) -- (4.7,0) node[below] {100};
\draw[-] (7.2,0) -- (7.2,0) node[below] {$L$};
\end{tikzpicture}
\caption{Relationship between fertility and land under egalitarian (dotted line) and inegalitarian inheritance (solid line), with $\alpha=0.7$, $\beta=0.9$, $\phi=0.12$, and $\bar{L}=30$.  }
\label{fig:fert}
\end{figure}